Chemical Industry Wastewater Treatment

Chemical industry discharges all kinds of waste water in the production process.

Chemical industry wastewater mainly comes from production wastewater discharged from Petrochemical Industry, Coal Chemical Industry, Acid and Alkali Industry, Fertilizer Industry, Plastic Industry, Pharmaceutical Industry, Dye Industry, Rubber Industry, Detergent Industry , Explosives and Primary Explosive Industry ,etc.

Waste Water Quality Characteristics

The wastewater produced in the production of chemical products is characterized by large discharge, high toxicity, high concentration of organic matter, high salt content, high chroma, high content of refractory compounds, and great difficulty in treatment

Waste Water Treatment Solution

The main measures for prevention and control of chemical wastewater pollution are as follows:

• Firstly, the production process and equipment should be reformed to reduce pollutants, prevent wastewater from being discharged, and carry out comprehensive utilization and recovery.
• Secondly,the treatment degree of wastewater that must be discharged shall be selected according to the water quality and requirements.

The Primary Treatment mainly separates suspended solids, colloid, floating oil or heavy oil in water. Water quality and quantity regulation, natural sedimentation, floating and oil separation can be adopted.

The Secondary Treatment is mainly to remove the biodegradable organic dissolved substances and some colloidal substances, reduce the biochemical oxygen demand and part of the chemical oxygen demand in the wastewater, and generally adopt the biological method for treatment. In the wastewater after biological treatment, there is still a considerable amount of COD, sometimes with high color, smell and taste, or because of the high requirements of environmental health standards, it needs to be further purified by the three-level treatment method.

The Tertiary Treatment is mainly to remove the organic pollutants and dissolved inorganic pollutants that are difficult to be biodegradable in the wastewater. The commonly used methods include activated carbon adsorption and ozone oxidation, as well as ion exchange and membrane separation technologies. Various chemical industrial wastewater can be treated by different methods according to the requirements of different water quality, water quantity and discharged water quality after treatment.

Biological Treatment 

In the early stage of the development of chemical industry, chemical pollutants are mainly inorganic pollutants such as acid and alkali. Generally, simple physical methods and chemical neutralization methods are used for treatment to achieve harmless treatment. With the development of organic chemical industry, especially the development of petrochemical industry, many wastewater contains a large number of organic pollutants, and biological treatment has become one of the main methods of chemical wastewater treatment.

• High-load activated sludge process is often used for biological treatment of petrochemical wastewater.
• The organic chemical wastewater with small flow rate is treated by biofilm method, and the effect is good.
• High concentration organic chemical wastewater with BOD content more than 5000 mg/L can be treated by anaerobic biological treatment to degrade organic pollutants.

The effluent of chemical wastewater after biological treatment still has a considerable amount of COD, sometimes with high color, odor and odor, which can be treated by activated carbon adsorption or ozone oxidation.

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